An underlying error of 407 ‘Proxy Authentication Required’ - is usually resolved by the customer IT team enabling proxy authentication bypass.
The customer is usually asked if they can access the following links in a browser first, in addition to sending PSL a copy of their error log;
https://webservices.presentationsolutions.co.uk/licensing/LicenceValidation2.svc.
https://webservices.presentationsolutions.co.uk/licensing/errorservice2.svc.
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